Dye decomposition by inorganic−organic hybrid base on Preyssler-typepolyoxometalates

Lately, industrial growth has enhanced intensive environmental difficulty in which pollutionof water is the main subject. The existence of dyes along with other pollutants prevent thebiological treatment methods also enforce allergic reactions [۱]. Rhodamin B (Rh.B) is acarcinogen and dangerous dye for human beings. Several procedures have been presented for theelimination of dyes such as sorption and membrane segregation. But the mentioned methodshave disadvantages like high cost, be time-consuming [۲]. Polyoxometalates (POMs) arenanoscale anionic metal-oxide clusters of d-block transition metals, which play a very active rolein many fields such as homogeneous and heterogeneous catalyses, electrocatalysis,photocatalysis, materials science, molecular magnetism and spintronics, and macromolecularcrystallography due to their structural diversity, electronic properties, modifiability, tunability,and redox properties [۳]. In the vast family of POMs, the donut-shaped molecule consisting offive PO۴ tetrahedra surrounded by ۳۰ WO۶ octahedra is termed as Preyssler-type POMs([Mn+P۵W۳۰O۱۱۰](۱۵−n)−, abbreviated as [Mn+@P۵W۳۰](۱۵−n)− ), Preyssler anions display distinctiveproperties, among which the most notable are their (۱) high negative charges (−۱۲ to −۱۵),(۲) large oxidation potential, and (۳) reversible transformation. The diameter of the internalcavity of Preyssler clusters approaches ۵ Å, large enough to accommodate at least one metalcation (Mn+) [۴]. In this study, inorganic−organic hybrid consisting of the Preysslerpolyoxometalate, [Mn+P۵W۳۰O۱۱۰] (۱۵−n)− with PDA (p-phenylenediamine) were synthesized by anew straight forward method [۵]. After calcinated in ۵۰۰ ◦C, prodact characterized by fieldemission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR)spectroscopy, X-ray diffraction (XRD). At the end, used nanocatalysis for decomposition oforganic dye, rhodamine B (RhB), and be reused nanocatalysis for at least ۴ cycles